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SLM-3650 Satellite Modem
Operation
N
S
N
A
C
B
S
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SATELLITE MOTION AND ORBITAL INCLINATION
GEO-SYNCHRONOUS
INCLINED ORBIT
GEO-SYNCHRONOUS
EQUATORIAL ORBIT
SATELLITE
N/S
MOTION
Figure 3-33. Doppler Shift
3–96
MN/SLM3650.IOM
A
A SATELLITE IS MAINTAINED AT AN
ASSIGNED GEOSTATIONARY
LOCATION THROUGH THE USE OF
GROUND COMMAND ADJUSTMENTS
TO ITS N/S AND E/W LOCATION. THIS
SATELLITE
PROCESS, KNOWN AS SATELLITE
NOMINAL
STATION-KEEPING, IS USED TO KEEP
POSITION
THE SATELLITE DRIFT WITHIN
CERTAIN BOUNDARIES.
AS STATION-KEEPING FUEL
BECOMES EXHAUSTED, THE N/S
STATION-KEEPING IS LIMITED
TO PRODUCE A MORE INCLINED
ORBIT, THUS PROLONGING THE
LIFE OF THE SATELLITE.
THE N/S MOTION CHANGES THE
PATH FROM THE SATELLITE TO THE
EARTH, RESULTING IN FREQUENCY
CHANGES KNOWN AS THE DOPPLER
EFFECT.
Revision 3
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